Palaearctic communities dominated by Carex acutiformis, more tolerant of desiccation than Carex acuta, forming beds on mesotrophic, base-rich, neutral to slightly acid, peaty or mineral soils. Large beds may form in fens, often with Carex paniculata; otherwise, they are widespread along watercourses on the landward side of Carex acuta or Carex vesicaria beds, in alluvial plains, ditches and depressions of humid meadow systems; they may occupy stations that almost totally escape periodical inundation.